If you want to make profit by trading then there are two great websites to use while trading cards. First one is peakmonster.com . The best thing about this website is you can make a bid on cards. There are times that people need money quickly so they. sell their cast cheaper to cash out so if you make bids then you will buy them quicker and cheaper by making bids.
The second best one is monstermarket.io . You will get dec cash back when you trade cards on their website which no other marketplace has this function.